Martin Victor Lyttelton has been found guilty of a brutal attack on his former business partner and his wife.
Lyttelton has been on trial in the High Court in Auckland charged with attempted murder, aggravated robbery and causing grievous bodily harm.
A jury has found him guilty on all three charges.
The Crown case was that Lyttelton injured Richard Ord with a hunting knife, and shot his wife Colleen Fenton at their home.
Ms Fenton said during the trial that her husband had been business partners with Lyttelton but their relationship broke down and they ended up in court over a shareholding dispute.
Lyttelton shot her in the leg, and also drew a hunting knife, but Mr Ord managed to hold him off until police arrived.
The Defence argued Lyttelton had gone to their house intending to commit suicide.